Cellulose acetate nitrate

Synthetic Membrane Appropriate inert and commercially available synthetic membranes such as polysulfone, cellulose acetate/nitrate mixed ester, or Polytetrafluoroethylene 70 Fm membrane of appropriate size to fit the diffusion cell diameter (e.g., 25 imn in above case). 

OTHER COMMENTS used in the manufacture of furfuralphenol plastics used in the manufacture of varnishes solvent for cellulose acetate, nitrate eotton, and gums used in the synthesis of furan derivatives and in the preparation of pyromueic acid also used as an insecticide, fungicide and germicide reagent in analytical chemistry. 

Development of a Stable Aqueous Membrane. An aqueous LiBr membrane was fabricated by soaking a porous 47 mm diameter cellulose acetate/nitrate membrane in a 3 M LiBr solution for 24 hours. The membrane was then exposed to a vacuum for 5 hours to remove the water while leaving the lithium bromide. It was then placed into the apparatus shown in Figure 7 and exposed to a nitrogen mixture containing approximately 10 mmHg water vapor until the pores filled via condensation. 

The choice of the polymer support for the liquid membrane matrix is function of not only pore size but also of chemicid compatibili fill. For a ILM with a long lifetime, a matrix material which is inert to the liquid phase is required. The cellulose acetate/nitrate supports used in these experiments, which lost their initial structural... 

BTV Brookfield thermoset viscosity CAN cellulose acetate nitrate... 

Isoamyl butyrate Phenoxyethanol plasticizer, cellulose acetate lacquers Dimethyl phthalate plasticizer, cellulose acetate, nitrate 2-Nitro-1,1 -biphenyl plasticizer, cellulose compounds N,N-Butyl benzene sulfonamide plasticizer, cellulose ester N-(2-Hydroxypropyl) benzenesulfonamide plasticizer, cellulose ester plastics Dihexyl phthalate... 

Cellulose acetate Cellulose acetate-butyrate Cellulose acetate-nitrate Cellulose acetate-propionate... 

The carboxylic acid groups were converted first to the potassium salt and then to Co(II) salts by addition of cobalt(II) acetate solution to the copolymer latex with agitation in an ultrasonic bath to produce the latex catalysts listed in Table 1. The latexes were purified by ultrafiltration through a 0.1 im cellulose acetate/nitrate membrane (Millipore) until tiie conductivity of the filtrate at 25 C was constant at 40 x lO" ohm l cm"l. Purified latexes contained 1-2% solids. An upper limit of 3 x 10" for the firaction of Co(II) not bound to the latex was established by addition of 1,10-phenanthroline to the ultrafiltrate and UV-visible spectrophotometric analysis of tiie Co(II) complex. By the same criterion, addition of 6 mol of pyridine per mol of Co(II) to form the active catalysts did not extract cobalt ions from the latex. Thus practically dl of the Co(II) was bound to latex. A typical transmission electron micrograph of catalyst RC-1 is shown in Figure 1. 

Ultrafiltration of each catalyst with a 0.1 xm cellulose acetate/nitrate membrane (Millipore) revealed no blue CoPcTs in the filtrate. 

A little known use in dentistry of a common polymer group is in crown forms (Fig. 16) for contouring restoration surfaces in the mouth. Cellulose acetate-nitrate and cellulose triacetate forms are made by dipping an anatomically finished tooth form cast from low fusing alloy, into the resin solution in a volatile solvent. After drying the mold is removed by melting out the alloy form. 

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